/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
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** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
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** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtCore/qglobal.h>

#include <unistd.h>
#ifdef _POSIX_PRIORITY_SCHEDULING
# include <sched.h>
#endif
#include <time.h>

QT_BEGIN_NAMESPACE

QT_USE_NAMESPACE

Q_CORE_EXPORT volatile char qt_atomic_lock = 0;

Q_CORE_EXPORT void qt_atomic_yield(int *count)
{
#ifdef _POSIX_PRIORITY_SCHEDULING
    if((*count)++ < 50) {
        sched_yield();
    } else
#endif
    {
        struct timespec tm;
        tm.tv_sec = 0;
        tm.tv_nsec = 2000001;
        nanosleep(&tm, NULL);
        *count = 0;
    }
}

QT_END_NAMESPACE
